557287891 has 2 divisors, whose sum is σ = 557287892. Its totient is φ = 557287890.

The previous prime is 557287889. The next prime is 557287901. The reversal of 557287891 is 198782755.

It is a happy number.

557287891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 557287891 - 2¹ = 557287889 is a prime.

Together with 557287889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (557287091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278643945 + 278643946.

It is an arithmetic number, because the mean of its divisors is an integer number (278643946).

Almost surely, 2^557287891 is an apocalyptic number.

557287891 is a deficient number, since it is larger than the sum of its proper divisors (1).

557287891 is an equidigital number, since it uses as much as digits as its factorization.

557287891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1411200, while the sum is 52.

The square root of 557287891 is about 23606.9458210926. The cubic root of 557287891 is about 822.9242661686.

The spelling of 557287891 in words is "five hundred fifty-seven million, two hundred eighty-seven thousand, eight hundred ninety-one".